Business-backed efforts to extend dozens of expired U.S. tax breaks including those for corporate research, teachers' out-of-pocket expenses and energy-efficient appliances probably won't be considered until a post-election session of Congress, lawmakers and lobbyists said.

Lawmakers, including Senate Majority Leader Harry Reid and Senate Finance Chairman Max Baucus, tried to include some of the breaks in pending legislation to extend an expiring payroll tax cut. That effort didn't succeed, and the intense politics surrounding U.S. tax policy may discourage lawmakers from acting until the end of 2012.

"It just makes it impossible to get where we need to be until after the election" on Nov. 6, said Representative Patrick Tiberi, an Ohio Republican and member of the House Ways and Means Committee.